Thermium

Thermium is a manufactured material with excellent thermal conductivity.

Properties
Melting Thermium will turn it into Liquid Niobium (5% mass) and Tungsten (95% mass).

Usage
Thermium increases the overheat temperature of buildings it's used to construct by 900 °C. It can be used to construct buildings in extremely hot environments.

Metal Refinery can convert Thermium to Niobium. 100 kg Thermium = 100 kg Niobium.

Rock Crusher can produce Niobium and Sand from Thermium. 100 kg Thermium = 50 kg Niobium + 50 kg Sand.

Production
Molecular Forge can produce Thermium from Niobium and Tungsten. 5 kg Niobium + 95 kg Tungsten = 100 kg Thermium.

Tips

 * Thermium can be converted into Niobium at 1:1 rate in the Metal Refinery. This is effectively converting 95 kg of Tungsten into Niobium, thus, only one or two trips to a Niobium-containing asteroid may be required to "prime" the further conversion. It's important to note, however, that Tungsten is a limited resource, as its only source is the initial amount of Wolframite ore in the Frozen Biomes of the starting asteroid, or expensive space missions to asteroids with Tungsten, so some care is required.
 * Thermium's high overheat cap is indispensable for lategame projects, such as running Super Coolant through Thermo Aquatuner or in the construction of a sour gas boiler.